No shell; mantle covers the whole surface of the body; radula with squarish teeth.
Shell internal, or absent; mantle restricted to the anterior and middle part of the body; radula with squarish teeth.
9), which, on transverse section, have the form of a cross constituting the two diagonals of the rhombic or squarish pattern of the mineral.
D'Orbigny's name for a genus of Perforate Foraminifera, distinguished by the flattened, lenticular discoid shell of many turns, finely perforated; chambers subdivided by incomplete septa into squarish chamberlets.
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